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Lab talk, the good, the bad, and the ugly
Zirconium
Long Span Implant Retained Bridges - Problem With Breaking
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<blockquote data-quote="JohnWilson" data-source="post: 256911" data-attributes="member: 213"><p>Ill chime in</p><p></p><p>I have a fair bit of experience with these big arches, everything I read in your post sounds great. Just be certain that its true.</p><p></p><p>I see some interesting things from the pictures. </p><p></p><p>When ever I see a fracture and one of the cad bases are out its a model verification issue in my opinion. Another observation is the cad bases that has all the stain/tarter on it below the seating surface again leads me to believe the prosthetic was not fully seated. When I look closely at the cad bases it appears they are rounded over hexed units and not prefab Non eng cad bases???? Maybe its the picture? All of these things will lead to have instability and torque to the appliance.</p><p></p><p>Anyhow your protocol on your side based on your description of how you verify the cast sounds great but are you putting you clients to the test prior to moving on with ANY design? Really hard to fool a stone jig but not impossible.</p><p></p><p>Everyone of my 450 arches that I have in the mouth over the last 3.5 years have confirmation sent to me. I have had some fail early on and MANY MANY fail in the lab but I know when I look at why in the lab failures happen its always human error. </p><p></p><p>I need quality images of EVERY fixture and they must be taken at a right angle to the table of the fixture or I will not proceed to a beta let alone a final restoration. Too often the film is taken with a descending angle which can give you a false sense of accuracy.</p><p></p><p>Hold them accountable. Use the correct zirconia for the case, minimize post sinter modification, and above all else maintain the correct dimensions by doing a survey with your 2d cross section tool. This material is super strong and for it to midline fracture is rare, generally its distal extensions that fail due to poor ap and techs/dr's pushing to get more occlusion than they should. Also that case with gingiva is not designed appropriately for a bunch of reasons and the dimensions are not suitable in my opinion. Not saying thats why it broke but anyhow.</p><p></p><p>Its super frustrating to have failures and super dangerous when these sorts of cases fail in the mouth, ask more questions and above all else learn to say NO when you know things are not ideal. Good luck</p></blockquote><p></p>
[QUOTE="JohnWilson, post: 256911, member: 213"] Ill chime in I have a fair bit of experience with these big arches, everything I read in your post sounds great. Just be certain that its true. I see some interesting things from the pictures. When ever I see a fracture and one of the cad bases are out its a model verification issue in my opinion. Another observation is the cad bases that has all the stain/tarter on it below the seating surface again leads me to believe the prosthetic was not fully seated. When I look closely at the cad bases it appears they are rounded over hexed units and not prefab Non eng cad bases???? Maybe its the picture? All of these things will lead to have instability and torque to the appliance. Anyhow your protocol on your side based on your description of how you verify the cast sounds great but are you putting you clients to the test prior to moving on with ANY design? Really hard to fool a stone jig but not impossible. Everyone of my 450 arches that I have in the mouth over the last 3.5 years have confirmation sent to me. I have had some fail early on and MANY MANY fail in the lab but I know when I look at why in the lab failures happen its always human error. I need quality images of EVERY fixture and they must be taken at a right angle to the table of the fixture or I will not proceed to a beta let alone a final restoration. Too often the film is taken with a descending angle which can give you a false sense of accuracy. Hold them accountable. Use the correct zirconia for the case, minimize post sinter modification, and above all else maintain the correct dimensions by doing a survey with your 2d cross section tool. This material is super strong and for it to midline fracture is rare, generally its distal extensions that fail due to poor ap and techs/dr's pushing to get more occlusion than they should. Also that case with gingiva is not designed appropriately for a bunch of reasons and the dimensions are not suitable in my opinion. Not saying thats why it broke but anyhow. Its super frustrating to have failures and super dangerous when these sorts of cases fail in the mouth, ask more questions and above all else learn to say NO when you know things are not ideal. Good luck [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Zirconium
Long Span Implant Retained Bridges - Problem With Breaking
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